What does unable to verify mean?

In the first one, ("Flashbeagle") I noticed the names of writers and songwriters from Sesame Street and they are definitely not listed in the actual credits so tried to delete them, but the won't let me. There were also Sesame St. people listed in the page for "Happy New Year, Charlie Brown". By the way, is it possible to show my contribution history to others besides myself?

@Michelle What about a situation where actors are credited on the opening credits of a TV show, but do not appear in an episode? In recent weeks I've had problems where some edits are being rejected. A screen capture won't help. Mykelti Williamson is in the credits for The Fugitive but not in every episode. Lance LeGault is in the credits for Werewolf but not in every episode. I've watched these shows in recent weeks. I've submitted changes. Some are accepted, some are rejected. Seems like there's no consistency. And sending a screen capture won't help because I need to prove that someone isn't in the episode. Do I just keep submitting it until a second or third person lets it through. I hope that's not the answer. I want to help make the site more accurate but I can't just keep submitting the same thing over and over. Who has time for that??